Intermediate 100K ultramarathons in United States

High-altitude trails above 10,000 feet through alpine meadows, ghost towns, and mining relics, with sweeping views of the South Park Valley and Decalibron peaks

Continental Divide National Scenic Trail route, high-elevation mountain terrain, technical sections, skree fields, diverse climbs and descents

Rugged 100-kilometer course through the wild trails of the Alleghenies, rocky ridges, sparse aid stations, and punishing midsummer heat

Eight out-and-back segments from a central hub, spanning Vero Beach and Sebastian, with tropical waters, jungles, rugged trails, and 22 bridge crossings

Challenging 100k course on the Pacific Crest Trail through Siskiyou Mountains, with Mt. Shasta and Cascades vistas highlighting Ashland's terrain

Scenic Finger Lakes hills and valleys, swamplands to hilltops, steep descents, gully rim trails, finishing at the culturally significant Great Hill

100-mile Vermont trail race with 17,000 feet of elevation gain, rolling hills, country roads, forested trails, and southern Green Mountains scenery

Scenic Illinois River trails with 100 mile, 100k, and 50k options; roughly 23,500 feet of elevation gain and rustic woodland terrain at Camp Wokanda

Mountain trails from John L Harvey Stadium to Snow Valley Peak and Tahoe Rim Trail, featuring Ash Canyon climbs, remote aid stations, and Ultra Lounge finish

Looped cross-country and single track trails with small hills at Mississippi College Choctaw Trails; intense heat and humidity expected

Rugged high-altitude ultramarathon through State Forest State Park, with alpine lakes, rocky ridges, remote trails, and 14,500 feet of elevation change

Northern Sierra Nevada trails with steep elevation gains, raw terrain, and views of mountain lakes, granite ridges, and dense forests

Mostly rail trail course connecting Belleville, WI to Orangeville, IL, passing through small towns and scenic stretches with frequent aid stations

Paved point-to-point road ultra from Hilo to Waimea, with major early climbing, a long descent, and a tough exposed Saddle Road course

Mountain single-track circuit with over 11,000 feet of climbing, three major ascents, isolated second half, summit at Maiden Peak, minimal road access

High-altitude routes through Utah's remote Tushar Mountains, featuring alpine lakes, rugged peaks, mountain canyons, and a summit of Delano Peak at 12,174 feet.

Exceptionally challenging Wasatch Mountain loop with over 15,000 feet of elevation change, three major climbs, and a mix of dirt trails, roads, and mountain sc

Night-long 100k loop through Talladega Forest on rolling dirt and gravel roads, starting at Frog Pond Overlook, with alternating course direction each year.

Out-and-back 10-mile loop on mostly flat gravel paths with gentle rolling hills and tree-lined country scenery, supporting shoes for local students

Point-to-point 100K with 14,200 feet of elevation gain, single-track trails, Olympic Range views, and scenic segments along Gold Creek and Dungeness River